linux-kernel - [PATCH v2 10/24] x86/sev: Fix noinstr for vc_ghcb

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Message-ID: <20210624095148.250770465@infradead.org>
Date:   Thu, 24 Jun 2021 11:41:09 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     jpoimboe@...hat.com, tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        joro@...tes.org, boris.ostrovsky@...cle.com, jgross@...e.com,
        x86@...nel.org, mbenes@...e.com, rostedt@...dmis.org,
        dvyukov@...gle.com, elver@...gle.com
Subject: [PATCH v2 10/24] x86/sev: Fix noinstr for vc_ghcb_invalidate()

vmlinux.o: warning: objtool: __sev_put_ghcb()+0x88: call to __memset() leaves .noinstr.text section
vmlinux.o: warning: objtool: __sev_es_nmi_complete()+0x39: call to __memset() leaves .noinstr.text section

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/kernel/sev-shared.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -64,7 +64,7 @@ static bool sev_es_negotiate_protocol(vo
 static __always_inline void vc_ghcb_invalidate(struct ghcb *ghcb)
 {
 	ghcb->save.sw_exit_code = 0;
-	memset(ghcb->save.valid_bitmap, 0, sizeof(ghcb->save.valid_bitmap));
+	__builtin_memset(ghcb->save.valid_bitmap, 0, sizeof(ghcb->save.valid_bitmap));
 }
 
 static bool vc_decoding_needed(unsigned long exit_code)